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You can synchronize the entire operation, synchronize the individual steps, or invent some sort of "soft" scheme that will tolerate inconsistency.– Hot LicksCommented Mar 14, 2014 at 12:03
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1@HotLicks : just added some more details. there is another method too which returns a value from map2. which locks should be used? map1 or map2? in method1 and getFirstName() methods?– user2066049Commented Mar 14, 2014 at 12:09
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You just need to lock against THE EXACT SAME OBJECT in ALL methods which access the sets (in a manner where their being in sync is important). Could be map1, map2, or something else. There are those who strongly advocate using a specific singletonish lock object, but I'm not convinced of that.– Hot LicksCommented Mar 14, 2014 at 12:17
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